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The Fantini G.70 chain saw cutting machine has been used by the company Marmor, Seţana d.d. since the year
2002. As evident from the photo, transportation of the machine requires a high-performance loader.
Additionally, the connection to the control unit is done via hydraulic hoses which must be disconnected and
reconnected for every movement of the machine. Machine setting procedures require a lot of time;
approximately 2 hours are needed for each cut. An advance section consists of four horizontal and three vertical
cuts. An upgrade to the old Fantini G. 70 cutting machine is represented by numerous new mobile models. At the
company Marmor, Seţana d.d., we have selected the Fantini GU 70/R model. The Fantini GU 70/R model has
been upgraded with a mobile unit, problems with hydraulic hoses have been eliminated, its dimensions and
mobility allow cutting of larger widths and lengths, rotation of the blade in several directions allows cutting of
the rear wall. After finished cutting, the machine automatically corrects the cut in order to avoid the risk of
cutting into the safety pillars. Diamond cutting elements are used for cutting. An advance section cut with the
new machine consists of five horizontal and three vertical cuts.
Chain saw cutting
machine Fantini G.70
Mobile chain saw cutting
machine Fantini GU 70/R
Weight 6,000 kg 26,000 kg
Weight of the hydraulic unit 2,000 kg -
Total installed power 52.2 kW 60 kW
Blade run speed 0 – 0.07 m/min 0 – 0.08 m/min
Hydraulic oil tank capacity 300 l 450 l
Cut width 38 mm 38 mm
Blade length 2,900 mm 3,200 mm
Minimum gallery advance 71 m 3 85 m 3
Minimum advance section cutting
cycle 41 h 47 h
Table 1. Presentation of properties of both Fantini chain saw cutting machines. [3]
Advance effects resulting from the introduction of the new machine compared to the previous model:
Approximately 20% more material excavated from a minimum advance section.
The time required for setting the machine before operation has been cut in half.
Easier movement and faster retreat from the cutting location in case of danger.
A new blade and electronics prevent the risk of cutting into the safety pillars.
Modified geometry of cutting the advance section (increased distances between cuts).
Beside the cutting equipment, natural stone excavation also requires high-performance loaders, powerful
compressors, lifts, hydraulic rollers and water cushions with a water pump.
The effective cutting depth of the new Fantini GU 70/R machine is 3.2 m. The geometry of cuts consists of five
horizontal and three vertical cuts. If compared to the previous Fantini G.70 machine, the distribution of
horizontal cuts is changed by adding another horizontal cut which increases the height of the underground terrain
from 4.5 m to 5.2 m or more. The distribution is adapted to the best possible yield of material from an advance
section. Lower distances between horizontal cuts have been increased in order to obtain blocks of maximum
height dimensions for further processing. Certain horizontal cuts can be omitted, but due to the structure and
cracking of the site, this might aggravate the work and increase the exploitation costs. As excavation at higher
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